PREDICTION AND EXPERIMENTAL VERIFICATION OF THREE-DIMENSIONAL WOVEN COMPOSITE PREFORM FIBER VOLUME FRACTION

doi:10.19936/j.cnki.2096-8000.20210428.005

Abstract

Abstract: Fiber volume fraction is an important indicator for the design and analysis of three-dimensional woven composites, and has a great influence on the impregnation process and material properties of composites. In order to determine the fiber volume fraction of the three-dimensional woven composite preform, the meso-structure model of the quadrilateral and triangular preforms was established. The preform is divided into unit cell forms such as interior cell, side cell, corner cell, etc. The unit cell type coefficient is determined and the preform is represented by a matrix according to the unit cell arrangement. The fiber volume fraction of the preform is calculated by the unit cell type coefficient matrix and the unit cell volume. The fiber volume fraction theoretical value is compared with the actual measured value obtained by the weighing method. The results show that the theoretical calculation model of preform fiber volume fraction is accurate, and the error is controlled within 4%. The fiber volume fraction increases with the increase in the number of fiber strands in the Z direction, and decreases with the increase of the size. When the size increases to a certain value, the fiber volume fraction approaches the same. The measured value of fiber volume fraction decreases with the increase of the number of weaving layers and the number of fiber strands in the horizontal plane. Finally, the possible reasons for the above conclusions are analyzed. This calculation method can provide a theoretical reference for the prediction of fiber volume fraction of arbitrary shape preforms.

Key words: composite preform, fiber volume fraction, unit cell, weighing method

CLC Number:

TB332

LI Chun-hui, HE Lei, WANG Zheng-fang, CHENG Xiang. PREDICTION AND EXPERIMENTAL VERIFICATION OF THREE-DIMENSIONAL WOVEN COMPOSITE PREFORM FIBER VOLUME FRACTION[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(4): 35-40.

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